Testing machine



Dec. 1; 1931.

S. N. SENNA TESJTING MACHINE Filed June 22, 1929 INVENTOR. b v/ Z7 A TTORNEY.

Patented Dec. 1, 1931 UNITED sT rEs;

INC., A CORPORATION OF MASSACHUSETTS,

PATENT OFFICE SAMUEL 1v. SENNA, or cHIcorEE, MASSACHUSETTS, n'ssreivon TO B. F. PERKINS a son,

TESTING MACHINE A lication filed June 22,

This invention relates to improvements in testing machlnesand is directed more particularly to improvements in testing machines of the type disclosed in the patent'to' 6 F. P. Cleveland No. 1,025,110 of April 30,

which is arranged to clampa specimento the tended by fluid pressure through the form aperture so as to rupture the speclmen platform. Both of these are providedwith a central aperture therethrough and a yieldable diaphram below the platform is displattherebetween which constitutes the test of the specimen.

Such machines are employed for testing specimens of web material like paper and cardboard ranging in thickness from a few thousandths of an inch for thin paper to a considerable thickness like that of corrugated board. It is desired that all specimens be firmly clamped between the clamp and platform and with a. more or less even pressure. It will be appreciated that with the parts arranged for moving the clamp and platform towards and away from one another a definite distance that the clamping action will differ when clamping specimens of different thicknesses. As for example if the parts are arranged to properly clamp a thick specimen such as corrugated board a thin specimen would be clamped improperly. Likewise an adjustment for thin paper would tend to unduly press upon and even crush a much thicker specimen.

The principal object of this invention is the provision of novel mechanism for effecting a relative movement of the specimen clamping members of a testing machine which is adjustable to vary the movement thereof whereby the apparatus'may accom-,

modate specimens of different thicknesses and thereby attain the desired clamping effect without injuring the specimen.

The objects are accomplished by means of the novel combinations and arrangements of parts to be more fully described in the form of the invention at present preferred and 1929. Serial No. 372,966.

illustrated in the'accompanying drawing in which:

The figure is. a partial side elevational view of a testing machine embodying the novel features ofthe invention.

Referring to the drawing the invention will now be described in detail.

' A frame of a testing machine of the type shown in the patent referred to is represent,-

ed at F. A platform P associated therewith has a central aperture below which is disposed a distendable diaphram D. As in the patent referred to the diaphram is distended by fluid pressure to rupture a specimen clamped to. the platform by a clamp C.

The clamp has upwardly extending arms 2 connected to a' hub 4 carried at the lower end of a'rod R which is reciprocable in the I frame F. Y 1

A reciprocation of the. rod will move the clamp towards and away from the platform. To operate the clamp and rod through vari-' ous distances for clamping specimens of different thicknesses and to lock the clamp in, clamping position the novel features'of the invention are directed and will now be described. '7 r i A head 10 fixed to the upper end of the rod is provided with a slot therethrough for receiving a clamp actuating lever 12 pivoted at 14 to the frame F. A shaft 16 rotatable in the head has fixed thereto a cam member 18 which lies within the slot of the head so as to he rotatable therein by a rotation of'the shaft. The cam underlies the lever 12. As will beseen the cam is provided with a non-concentric peripherial surface. That is it has a plurality of peripherial points 19, 20 and 21 which are of different distances from the axis of the shaft. A spring 22 .disposed between the head and frame urges the rod upwardly so that the cam engages the underside of lever 12 .to urge it upwardly to its upper position shown. It will be readily obvious that accordingto thesetting of the.

cam: the clamp G will when in its upper p'osition' assume positions at various distances" or heights above the platform. g

It is] preferable that' the'lever 12 swing througha constant angle so that with the clamp at these various heights it will be moved by the operation of the lever 12 through a constant distance. The cam is arranged to locate the clamp nearer the platform for thin specimens than for thicker specimens, Wherefor equal pressure may be maintained and a thick specimen clamped without injury.

A cam lever may be fixed to the shaft 16 o fac li a e the ro t on thereof While de igr nating characters A, B, G on the head 10 co; operate with a pointer 32 of the lever to indicate whether the cam is set for clamping thick, thin or intermediate specimens.

Of course instead of the characters shown lettering may be employed such as paper, corrugated board, etc. Cams of other forms may be employed tovary the relative position of the parts all Withinthe spirit of the invention;

Mechanism for operating the lever 12 will now be described. An operating lever 40 is pivoted at 42 in a lug F of the frame F and carries on its outer end a handle 44; i A link 46'ispivoted at opposite ends asat 4S and 50 to the levers 12 and 40 so that as lever 40 r is oscillated the lever 12 is swung up and down so as to movev the clamp into and out of clamping position.

In operation the lever 40 is swung in a clgckvvise direction tornove the clamp into clamping position and reversely for unclamping. In clamping position the levers and link assume the position shown in dot: dash lines. The parts are preferably so arranged that in this position the end of lever 12 may abut the lug F of the frame while the pivot-ally connected levers '12 and 40 and linkaet as a toggle to lock the parts in position whereby the clamp is locked in lower. clamping position.

I am aware that many changes may be made in the form of the invention without departing from the, spirit and scope thereof and I prefer therefore to be limited by the appended claims rather than by. the foregoing s riptio What I claim is:

testing machine comprising, a frame, a clamp, rod slidable therein, a lever pivoted to, said frame, a cam member rotatable on said rod and underlying said lever, an operating lever pivoted on said frame, and connections between said levers. v

2., A testing mach'ne comprising in comsaid frame, a lever pivoted at one end to said frame and at one side of said rod and extending transversely of the axis of said rod, an operating lever pivoted to the said frame at the opposite side of said rod, connections between the other end of said first-named lever and said operating lever, and a cam rotatable insaid rod and which has portions underlying said first-named lever and engageable hereby- 4.- A testing ma hin p ng, a frame, a clamp rod slidable therein, a lever pivoted to said frame, a cam member rotatable on said rod and underlying said lever, means to rotate said cam member, an operating lever pivoted on said frame, and connections between said levers.

5, A testing Tachine comprising, a frame, a clamp slida-ble therein, a lever pivoted to said frame, a cam member rotatable on said rod and underlying said lever, means yieldingly acting on said rod to yieldingly es id 9am into en e ent wi h said lever, an operating lever pivoted on said frame and connections between said levers. In testimony whereof I aflix my signature.

l V SAMUE N1 $E A- bin'ation, a frame, a clamp rod slidable in saidfraine, a lever pivoted in said frame at one side, of saidrodiand which extends transversely of the axis of said rod, an operating lever pivoted to said frame. at the opposite side of said rod, connections between said levers ,and a cam member rotatable on said rod and underlying said first-named lever.

Atesting machine comprising in comn on, a fra e; a. amp red dab a n. i 

